That's not a current feature. We'll poll and debate over it to see if we should add it to the feature set. We currently have several highly requested features to build and release over the coming weeks/months, so we ask for your patience.

Just to update further. As of 8/17/2014, volume level initialization is now supported by this plugin. You have a range of 0(mute) to 100(max) as the starting volume when a video is (auto) played. You can also defer to the users default volume if you're not interested in presetting a level.